Barrandeikalk-Formation (Hubmann, Osser-Formation / Osser Formation 1993; Flügel Et Al., 2011)
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FLÜGEL, 1961, 1975); Barrandeikalk-Formation (HUBMANN, Osser-Formation / Osser Formation 1993; FLÜGEL et al., 2011). During evaluation of the con- BERNHARD HUBMANN ceptional content of the formation and re-definition (HUB- MANN, 2003: p. 285–287) the Draxler-Formation (sensu Validity: Valid; first entry by VACEK (1891: “Osserkalk”); for- FLÜGEL, 2000: p. 25; equivalent to “unterer Schweinegg- malized by FLÜGEL (2000: p. 25; Osser-Formation). kalk” of ZIER, 1982) was synonymised with the Plabutsch Type area: ÖK50-UTM, map sheet 4223 Weiz (ÖK50- Formation. BMN, map sheet 134 Passail). Lithology: The succession represents a highly fossilifer- Type section: Not defined, but FLÜGEL (2000) defined the ous sequence dominated by dark marly bioclastic lime- hill Osser (N 47°20’40” / E 15°30’03”) north of Passail as stones. In the lower parts, especially at the boundary to type region. the underlying Flösserkogel Formation yellow to brownish Reference section(s): - shales occasionally blotched with moulds of chonetid bra- Derivation of name: After the hill Osser (1,548 m) north of chiopods are characteristic. In the upper parts of the for- Graz (FLÜGEL, 2000). mation intercalations of red marls and marly limestones Synonyms: Partly: Kalkschiefer [Folge] (CLAR, 1874; HE- are common. RITSCH, 1917c); Flaserkalk (Osserkalk) (CLAR et al., 1929); Fossils: Coral and sponge taxa dominate the diverse fau- Kalkschiefer-Stufe im Allgemeinen (WAAGEN, 1937); Kalk- na. Among tabulate corals most common are thamnopo- schiefer-Folge (H. FLÜGEL, 1961, 1975). rids (Thamnopora reticulata, Th. vermicularis, “Striatopora” Lithology: Bluish platy tectonically stressed flaser lime- suessi), favositids (Favosites styriacus, F. alpinus), and stones and grey dolostones with local intercalations of heliolitids (Pachycanalicula barrandei). The rugose coral marly clay/siltstones and sandstones. fauna is dominated by mostly fractured dendroid (phac- Fossils: Bad preserved rugose and tabulate corals. eloid) taxa. A frequent and distinctive phillipsastreid tax- on is Thamnophyllum (Th. stachei, Th. murchisoni). Stro- Origin, facies: Shallow subtidal environment. matoporoids are mostly recrystallized and thus precluding Chronostratigraphic age: ? Eifelian. precise determinations (common genera are Actinostroma Biostratigraphy: - and Clathrocoilona). Among brachiopods the thick valved Thickness: 50–100 m. Zdimir cf. hercynicus may occur in coquina horizons. For faunal list see H. FLÜGEL (1975: p. 44–46). Lithostratigraphically higher rank unit: Rannach Group (FLÜGEL, 2000, p. 25). Origin, facies: A deposition on a differentiated and gen- tly inclined carbonate platform of some few (tens) meters Lithostratigraphic subdivision: - is assumed (HUBMANN, 1993). Conspicuous is the rarity of Underlying unit(s): Flösserkogel Formation. in situ organisms, the intermittently high supply of clayey Overlying unit(s): Tyrnaueralm Formation? sediments (marl-limestone intercalations) and high supply Lateral unit(s): Plabutsch Formation? of lime mud, temporary influx of high amounts of conti- Geographic distribution: Styria, highland in the surround- nental phytoclasts and storm impacts (tempestites) (HUB- ings of Graz, southeast of the Teichalm; ÖK50-BMN, map MANN, 1995). sheet 134 Passail. Chronostratigraphic age: Eifelian; locally the sequence Remarks: - may range from Upper Emsian to Lower Givetian (HUB- MANN, 1993). Complementary references: STATTEGGER (1984). Biostratigraphy: - Schweinegg-Formation / Schweinegg Formation Thickness: 80–100 m, strong variation. BERNHARD HUBMANN Lithostratigraphically higher rank unit: Rannach Group. Validity: Valid; first description by ZIER (1982: “oberer Lithostratigraphic subdivision: In some sections at the Schweineggkalk”); formalized by FLÜGEL (2000: p. 35–36; base of the unit less than 5 m thick brownish to yellow Schweinegg-Formation). marly slates with moulds of chonetid brachiopods are Type area: ÖK50-UTM, map sheet 4223 Weiz (ÖK50- named Gaisberg Bed (FLÜGEL, 2000; HUBMANN & FRITZ, BMN, map sheet 134 Passail). 2004; HUBMANN & MEssNER, 2007). Type section: No type section defined, but FLÜGEL (2000) Underlying unit(s): Flösserkogel Formation (conformable appointed the Schweinegg (= Schweineck, 1,457 m), a hill contact, transgressive). southwest of Teichalmhütte in the Hochlantsch area as type region (N 47°20’52” / E 15°26’40”). Overlying unit(s): Kollerkogel Formation (conformable contact). Reference section(s): - Derivation of name: After a hill called Schweinegg in the Lateral unit(s): Flösserkogel Formation, Kollerkogel For- Hochlantsch region, approximately 55 km north of Graz. mation, Tyrnaueralm Formation, Osser Formation. Synonyms: Oberer Schweineggkalk (ZIER, 1982). Geographic distribution: Styria, highland in the surround- Lithology: Dark grey to brown fossiliferous limestones. ings of Graz; ÖK50-BMN, map sheets 134 Passail, 162 Köflach, 163 Voitsberg, 164 Graz. Fossils: Stromatoporoids, rugose and tabulate corals, cri- noids (see ZIER, 1982). Remarks: - Origin, facies: Subtidal depositional environment with mi- Complementary references: EBNER & HUBMANN (2012). nor terrigenous influx. 50 Chronostratigraphic age: Eifelian, Givetian? Lateral unit(s): Zachenspitz Formation? Biostratigraphy: - Geographic distribution: Styria, highland in the surround- Thickness: Less than 100 m. ings of Graz; ÖK50-BMN, map sheet 134 Passail. Lithostratigraphically higher rank unit: Lantsch Group. Remarks: - Lithostratigraphic subdivision: - Complementary references: FLÜGEL (2000). Underlying unit(s): Flösserkogel Formation (with tectonic contact). Kollerkogel-Formation / Kollerkogel Formation Overlying unit(s): Tyrnaueralm Formation. BERNHARD HUBMANN Lateral unit(s): Zachenspitz Formation. Validity: Valid; first entry by SUEss (1868: “ungeschich- Geographic distribution: Styria, highland in the surround- teter, … lichtgrauer Kalkstein, welcher … an den Westhän- ings of Graz; ÖK50-BMN, map sheet 134 Passail. gen des Kollerberges … entblößt ist”); formalized by FLÜ- Remarks: Parts of this formation which contain corals and GEL (2000: p. 25–26; Kollerkogel-Formation). stromatoporoids resemble the Plabutsch Formation resp. Type area: ÖK50-UTM, map sheet 4229 Graz (ÖK50- the Tyrnaueralm Formation of the Rannach Group. ZIER BMN, map sheet 164 Graz). (1982) distinguished two parts within the sequence, a low- er up to 60 m thick part of the succession which contains Type section: No type section defined, but FLÜGEL considerable amounts of stromatoporoids and corals and (2000) selected a type region at Kollerkogel (Kollerberg, an upper part with white fossil-free beds of limestones. 633 m) (N 47°03’46” / E 15°22’35”), a hill belonging to the Plabutsch-Buchkogel-Range west of Graz. FLÜGEL (2000) assigned ZIER’s lower part of the formation (“unterer Schweineggkalk”) to the Draxler Formation which Reference section(s): - was synonymised with the Plabutsch Formation by HUB- Derivation of name: After the hill Kollerberg (633 m) west MANN (2003). of Graz. Complementary references: GOLLNER & ZIER (1985). Synonyms: Helle Kalke (KUNTSCHNIG, 1937); Helle Kal- ke des Mitteldevon (SCHÄFER, 1937); partly: Korallenkalk (CLAR, 1874) and Mitteldevon-Gruppe (VACEK, 1891). Rotmüller-Formation / Rotmüller Formation Lithology: Grey dolomites with biolaminations, light blu- BERNHARD HUBMANN ish limestones (mostly mudstones), locally bioclastic lime- Validity: Valid; first description and formalization by EBNER stones with chert nodules. (1998: p. 128). Fossils: Rugose and tabulate corals, stromatoporoids, Type area: ÖK50-UTM, map sheet 4222 Leoben (ÖK50- conodonts. BMN, map sheet 163 Voitsberg). Origin, facies: Major parts of the sequence developed in Type section: No type section published because of bad an open platform setting; basal parts are shallow restricted outcrops; according to EBNER (1998) on both sides of the lagoonal deposits due to biolaminations, emersion hori- Arzbach valley from “Reicherhöhe” (998 m; N 47°12’24” / zons and pseudomorphs after gypsum. E 15°14’23”) in the southwest to “Rathlosgraben” in the Chronostratigraphic age: Givetian–Frasnian. northeast and in the vicinity of the farmstead “Rotmüller” (N 47°14’54” / E 15°14’52”) on ÖK50-BMN, map sheet 163 Biostratigraphy: varcus Zone; asymmetricus to triangula- Voitsberg typical outcrops of the formation may be seen. ris conodont zones. Reference section(s): See above; forest road west of Thickness: Strong variation in thickness; about 150 m. Reicherhöhe at altitude 880 m (EBNER, 1998) Lithostratigraphically higher rank unit: Rannach Group. Remarks: The Formation may be a lateral equivalent of the Lithostratigraphic subdivision: FLÜGEL (2000) included Tyrnaueralm Formation (EBNER, 1998: p. 128). four members in the Kollerkogel Formation. Derivation of name: After the farmstead “Rotmüller” Gaisbergsattel Member: dark grey biolaminated dolo- 40 km northwest of Graz. stones; about 20 m (up to 100 m) in thickness. Synonyms: - Kanzel Member: light grey to bluish limestones; mostly mudstones; up to 100 m in thickness. Massive light to dark grey dolostones. Lithology: Platzl Member: sequence of grey limestones intercalated Fossils: Stromatoporoids (especially amphiporids), rugose with carbonatic argillaceous shales; about 50 m in thick- and tabulate corals, crinoids, brachiopods. ness. Origin, facies: Subtidal depositional environment. Platzlkogel Member: grey limestones (in some places bio- hermal structures); about 75 m in thickness. Chronostratigraphic age: ?Eifelian – Givetian. Underlying unit(s): Plabutsch